| 摘要 |
A camera, lens positioning mechanism and method use a lens holding member to hold a lens therein for receiving optical information that may be captured on film or digitally. The lens holding member interfaces with a ring-shaped barrel member, geared ring or the like, that when turned in one direction by a motor forces the lens holding member out, or back, depending on a slope of a cam placed on the barrel member, slot in the barrel member or the like. When driven in the single direction, the cam member on the ring barrel member, forces the lens holding member in a predetermined direction. A biasing member connected to the ring provides an opposing force that when used during a focusing operation pulls the lens holding member and cam member back to a home position without the need of a driving force from the motor. A clutch mechanism engages and disengages the driving force of the motor on the geared ring depending on whether a focusing operation, lens storage operation, or zooming operation is performed. A transmission may be repositioned to drive several different driven members, where each position is determined by a rotation direction of the motor, and a particular stage at which the processing has been completed.
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